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- Title
Bootstrap capacitorless DCM VOT buck converter with dead-time-based off-time calibration for magnetic resonance wireless power transfer.
- Authors
Ma, Hyunggun; Namgoong, Gyeongho; Choi, Eunho; Park, Woojin; Lee, Bonyoung; Jang, Heedon; Park, Kyeongmin; Na, Kyungmin; Bien, Franklin
- Abstract
This study reports a miniaturised discontinuous conduction mode (DCM) variable on-time (VOT) buck converter providing an output of 1.8 V in the input range of 3–12 V to support applications with large wireless coupling. Conventionally, an additional large capacitor has been used as a bootstrap capacitor to drive the high-side switch of buck converters, which prevents minimisation. In this study, a standalone momentary power consumption level shifter is proposed to remove the additional bootstrap capacitor and increase the power conversion efficiency (PCE) in the buck converter. A Zener diode is utilised to reduce the power consumption of the level shifter. In addition, a dead-time-based off-time calibration circuit is proposed to further increase the PCE by reducing the low-side conduction loss. The proposed circuit is fabricated with a TSMC 0.18-µm BCD process, and the core circuit occupies an active area of 0.68 mm2 with two external components. It provides output currents in the range of 20 µA to 3 mA with a maximum switching frequency of 750 kHz. The maximum efficiency of the converter below 5 mW is 80.2%.
- Subjects
TAIWAN Semiconductor Manufacturing Co. Ltd.; WIRELESS power transmission; MAGNETIC resonance; CALIBRATION; INDUCTIVE power transmission; POWER capacitors
- Publication
IET Power Electronics (Wiley-Blackwell), 2020, Vol 13, Issue 9, p1787
- ISSN
1755-4535
- Publication type
Article
- DOI
10.1049/iet-pel.2019.0995